Honda Accord/Civic/Prelude 1973-1983 Repair Guide

Air Injection System

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OPERATION



See Figures 1 through 6

Beginning with the 1975 model year, an air injection system is used to control hydrocarbon and carbon monoxide emissions. With this system, a belt driven air pump delivers filtered air under pressure to injection nozzles located at each exhaust port. Here, the additional oxygen supplied by the vane type pump reacts with any unburned fuel mixture, promoting an afterburning effect in the hot exhaust manifold. To prevent a reverse flow in the air injection manifold when exhaust gas pressure exceeds air supply pressure, a non-return check valve is used. To prevent exhaust afterburning or backfiring during deceleration, an anti-afterburn valve delivers air to the intake manifold instead. When manifold vacuum rises above the preset vacuum of the air control valve and/or below that of the air bypass valve, air pump air is returned to the air cleaner.



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Fig. Fig. 1: Location of emission control system components-1975 1237cc AIR models with manual transmission; other years similar



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Fig. Fig. 2: Location of emission control system components-1975 1237cc AIR models with Hondamatic; other years similar



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Fig. Fig. 3: Emission controls system schematic-Accord with manual transmission



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Fig. Fig. 4: Emission controls system schematic-Accord with Hondamatic



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Fig. Fig. 5: Emission controls system schematic-Civic CVCC with Hondamatic



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Fig. Fig. 6: Emission controls system schematic-Civic CVCC with manual transmission

1975-82 1487cc, 1600cc and 1751cc Models
INTAKE AIR TEMPERATURE CONTROL

Same as 1973-74 models.

 
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